Compilare: main.cpp: In function 'int main()': main.cpp:12:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<a;i++) ~^~ main.cpp:14:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<b;j++) ~^~ main.cpp:26:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (d>s) ~^~ main.cpp:28:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<b;j++) ~^~ main.cpp:37:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<b;i++) ~^~ main.cpp:39:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<a;j++) ~^~ main.cpp:50:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (d>s) ~^~ main.cpp:52:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<a;j++) ~^~ main.cpp:60:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<a;i++) ~^~ main.cpp:62:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<b;j++) ~^~